The issue with nuclear is the extremely high initial cost, and it's not as set and forget it as the propaganda wants you to think. In short, because of nuclear decay chains the power can't be just ramped up and down willy nilly, some of the byproducts poison the chain reaction and power needs to be managed. Having nuclear as the bearer of the minimal load with solar/wind/battery power for the variable load is the way I think works the best, but I'm not an expert.